Rotary cutting device for razors



S. P. JONES.

ROTARY CUTTING DEVICE FOR RAzoRs.

APPLICATION FILED DEC. I8, 1918.y

Patented Apr. 27,

Mbna! Il 40 ing SIDNEY I. JONES, oE wAco, TEXAS.

EOTAEY CUTTING DEVICE Eon EAzoEs.

Specification of Letters Patent. Patented Apr. 27, 1920,

Application filed December 18, 1918.' Serial No. 267,251.'

To all whom t may concern:

Be it known that I, SIDNEY I. JONES, a citizen of the United States,residing at Waco, in the county of McLennan and State of Texas, haveinvented certain new and useful Improvements in Rotary Cutting Devicesfor Razors, of which the following is a specification. I

This invention relates to lcutting devices for mechanical razorsandparticularly to improvements in rotary cutting devices.

In experimenting with the construction of a cutting device to be used inconnection with a shaving guard having openings through which thecutting edges of the device are exposed I have discovered certain factswhich led me to make particular improvements in order to gain the mostefficient and satisfactory results. I

discovered that certain features were absolutely essential in thestructure of such a device and without them the cutting device wasneither safe nor efficient.

By actual tests I found that the cutting edges ofthe blades must onlyproject from the surface of the cutting memberjto a limited degree and.the surface of the cutting member must support the skin of the .face oneach side of the cutting edge, otherwise the cutting edge would cut theSkin which protruded into its path. In carrying out the invention it isbest to have a substantially smooth surface with a limited portion `ofthe cutting edge of each blade exposed on the surface of thecutting'member. T his gives a smooth shaving operation, whereas thecutting blade which has no support for the flesh on each side of thecutting edge will give a choppy and unsatisfactory shavoperation.y v

n afmore specific' embodiment of the invention a `rotatable cuttingmember is provided. 'Ihe member is formed with longitudinal latheraccumulating pockets having their open sides bridged by ribs formingpart of the surface ofthe member or an equivalent structure.Gage="'plates are removably fastened on the member between the ribbedpanels and have their outer surfaces'made smooth so as to form part ofthe surface of the cutting device in har- 'mony with the smooth outersurfaces of the ribs. When the gage plates are in position the cuttingdevice may have a substantially circular surface, but this is notabsolutely necessary and may be varied.

The gage plates hold in place and cover the greater portions of thecutting blades which have their cutting edges projecting fromeach'longitudinal edge of each gage plate. The cutting edges aredirected toward the ribbed panels and overhang the edges of the pockets.Grooves or channels are formed immediately under the cutting edges so asto give clearance and prevent an accumulation of lather or othersediment. 'Ihe cutting edges have only a limited projection and may`terminate leither slightly above or below the supporting surface of thedevice which is formed by the ribbed panels and gage plates. By makingthe gage plates or the cutting blades easily removable said blades maybe sharpened or replaced.

The invention will be more readily understood from a reading of thefollowing specification and by reference to the accompanying drawings,in which an example of the invention is illustrated, and wherein,

Figure l is a view of a rotary razor equipped with a cutting deviceconstructed in accordance with this invention.

i Fig. Q is a partial elevation showing the device applied to a razorwith a guard,

Fig. 3 is a plan View of thesame,

Fig. 4 is a detail of the cutting device,

Fig. 5 is a cross sectional detail on the line 54-5 of Fig. 4,

Fig. 6 is a vertical sectional detail on the line 6-6 of Fig. 5,

Fig. 7 is a detail of ,a modified form of cutting device, and

Fig. 8 is a perspective view of onev of the gage plates.

In the drawings the numeral 1 desig-l nates a handle .member'ha'ving afiat head 2 of larger diameter. On the head the base 3 of a shavingguard structure 4 is secured. I haye not shown the guard offset from thehandle as in my co-pending application filed of even date herewith,although the off-set.- construction is more advantageous `andpreferable. The guard structure com- 'to the surface of the cylinderbridge the entrance to each pocket. Between each row of ribs thecylinder is reduced .in diameter to form seats for cutting blades 12;Each blade is clamped in place by a gage plate j 13. The gage plateshave their outer sur faces smooth, and conforming to the same arc as thel ribs, whereby the c linder is given a circular cross-section.ach'plate has a pair of -apertured lugs 14:, as are 4shown in Figs. 6and 8, which are directed lnward and penetrate the blades 12. The lugsare received in. radial recesses 15 in the cylinder. Tapered lockingpins 16 are secured in the cylinder and pass through the apertures ofthe lugs 14, whereby the plates are drawn inward and the cutting ladesrigidly clamped in place.

The bladesproject from each side of each gage plate and it is obviousthat two single blades could be used instead of one double blade. Theplates cover all of the blades except their cutting edges. The cuttingedges of the blades overhang the edges of the pockets 10'and thoseportions of the ribs 11 underlying the cuttlng edges arefcut -away orrecessed at 17 so that said cutting edges are free throughout theirlengths and do not contact with the ribs; whereby no place for theaccumulation of matter is left anda highly sanitary structure had. Itwill be seen that a cutting edge is disposed on eachside of each row ofribs. These edges.

may terminate within, coincident with or slightly beyond the circle ofthe cylinder.

t will be seenthat the gage plates. and the ribspresent a smooth and'continuous surface with the .depressions caused by the recessesl.'v Thecutting edges project into" these recesses and are thus exposed on thesurfaceof'lthe cylinder. The skin of the person bein shaved is supportedb y the plates and rlbs on each side of the cutting edges and as theedges are onl projected to a slight degree, the beard a dy not the skin1s c'u f' The cylinder has a celtralopening 18 which receives a shaft 19so that the 'cylinder rests on a collar,20 base 3. The nally screw whichis seated in the upper yend of the-cylinder. A lock screw 22 upper endofthe shaft and overlaps -the nut` said screw bein countersunk in theupper vend of the cylin er. By these means the cylinder is made faston'theshaft. The 'shaft extends', down intozthe handle 1.- I have`,blade seats between the 'said seats having thelr edges exposedprojecting through the I shaft has its upper end exterthreaded' toreceive a nut 21 r is threaded -into the shown a motor disposed in thehandle and connected directly to the shaft ,for rotatingl v the same,but it is yto be understood that the shaft may be driven in variousWays.

Where a guard is used the cylinder is dis! posed in juxtaposition to theinner sides of the 'ribs 6 5. By limiting the projecting pf'thecutting'edges from the edgesof the gage plates 'so that the cuttingedges of the' blades 12 -are exposed through the openings the devicecould .be used without a guard,

as shown in Fig. 2. The operation of the razor has been fullyvexplainedin co-pending ap lications.

n Fig. 7 I have shown a modified form of structure which substitutes forthe ribs 6 a panel 23 having a vertical row offperforations 24. Thispanel is supported along each side by webs 25 4which are recessed underthe lcutting edges like the recesses 17 and have slots 26 therebetween.

' In shaving the lather passes intothe pockets 10 either between theribs and under the cutting edges or through thel perforations l24: andslots 26, so that nothing can lodge under the cutting edges.,v

vThe salient feature of this particular invention is the smoothsupporting vsurface of the cylinder with the cutting edges ex. lposed toa "limited degree over a clearance depression'fwhereby the skin oftheface isA supported by the surface portions of the l cylinder immediatelyven each side of the cutting edge and thev skin protected from cutting.I have. found that diametrically opposite gage be removed an` thesha-ving operation performed with the remainingy plates and blades. Whenit is desired to re lace the -blades they are readily remove by'unscrewing and withdrawing the pins 16 so' that the gage plates andblades may be lifted off.

across the .pockets and havin their outer faces concentric with thecylin rical surface ofthe head to support the skin, said ribs havingrecesses adjacent the ends thereof, pockets, blades on slightly beyondthe cylindrical surface of the head and lying beyond said recesses,means to clamp the blades on saidseats and j the he d an having recessesnear the opposite en thereof, curved blade seats between ioo lates andtheir blades can- 1 adjacent pockets, flexible double-edged bladesfitted on said seats, gage plates for clamping said blades on saidseatsiand having outer faces conforming to the cylindrical contour ofthe outer surface of the head, the blade edges arranged to projectslightly beyond the surface of the head and to lie beyond said recesses,means in the head to hold said gage plates in place, and means to rotatethe head.

3. A razor including a rotary head, means to rotate the head, bladeseats on the head inwardlyof the surface thereof, gage plates forclamping the blades on said seats with their edges exposed, said plateshaving studs entering the head, means in the head engaging the studs tobind the -plates in place, and guards beneath the blade edges.

el. A razor including a rotary head having longitudinally extendingvpockets opening through the outer surface thereof, guard ribs across theopenings in the pockets arranged contiguous to the surface of the headand having recesses'on the outer faces thereof,

blade seats formed in the head between the Rockets, gage plates fittingover said seats to old the blades in place and causing the edges of theblades to lie opposlte said recesses in the guard ribs, means forbinding the gage plates on the head, and means to rotate the head.

5. A razor including a rotary cylindrical head having an axial bore andlongitudinal pockets opening through the periphery thereof, blade seatsinward of the periphery and located between adjacent pockets, gageplates adapted to fit over the seats and hold the blades thereon,perforated studs on the plates, tapering pins passing through theperforations in the studs, series of spaced guard ribsv extending acrossthe pocket openings and having recesses beneathy the edges of theblades, a shaft passing through the axial bore in the head and made fasttherein, a handle connected to the head, and al motor in the handleoperatively connectedl to said head.l

In testimony whereof I alix my signature.

a SIDNEY P. JONES.

